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@JWestland
It is, to be pedantic, it is an assumption you can use more vitamin D without testing.
But since people aren't routinely tested, as long as you don't take mad doses it is fine to supplement. Note the NHS safe levels are lower than what studies use, so it may be worth taking a bit more than 10. There's some stuffs online about dosing.
NICE is investigating if NHS guidelines should be updated re covid and vitamin D.